Gas burner ignition apparatus and valve



Feb. 7, 1956 J. LUNDGREN 2,733,758

GAS BURNER IGNITION APPARATUS AND VALVE THEREFOR Filed Nov. 19, 1951 m9 Q I 557' .2 i t W fIwz/eh/ar hczm M M United States Patent GAS BURNER IGNITION'APPARATUS AND VALVE THEREFOR a This invention relates to an automatic ignition system for gas burning appliances, and particularly,to such a syst for ignitingjthe top burners on ages stove. n

It is an object of tliis invention to provide anoyel ignizf t iii h, flai s t sft a q li i kiflbhtsd automatically infresponse to -the openingof a sh rt ft valve for supplying sa iij toa main burner l 1 f T lt is also an object oi this invention ,fi10vide a novel igiiifiqfi systeingfo'r a min, 5& Remain wh sh. t eses supply to an ignition pilot burner is init ially nnder the cbn trol of a shut-off valve the main burner, and after lighting of the ignition pilot burner thenc-is established an auiiilia ry gas supply thereto which by-passe s theshut-oii va lve'f of the mainta ne i i I in:

Another object of thisin vention is to provide a novel ignitionsystem for a main gas burner; in whicln in response togas pressure resultingfrotnihe ,openingjpf a shut-off valve for the main burner, there is esta ished a gas supply to an ignition pilot burner whi oh by passe s valve 4 w, I R I. .Y v m i T further object of this invention is to provide a novel ignition system for a main gas burner which is operative.

to maintain a stand-by pilot flame in igniting relation to the main gas burner for a time interval jollowing the closingpi the burnerishut-oif valve to egitinguish thernain I m 1 I i v .2 i c a 1..., 'I. vii.

A still further object, of this invention is the provision of a novel ignition; system for a main gas burnenyvhich is-operative in response to gas pres sure resul "ng from theijopeniiig "of a slhlitzofi lve. t. t e in, a, m mo. establish a gas supply to; anf-ignition pilot bur ner inde; pendent of "said shut-off valveandyhich is operative to maintain that gas'supply to the ignitionpilot burner for a time interval following theclosing o f said main bnrner shut-oii-lvalvm g a j l, Assn further object of this invention is to provide a novel ignition system for the top burners on; a gasstove having anignition pilot burner for the ,top' burners.

lighted automatically foliowingI the opening of anyof the top burner valves in which the ;ignition :pilot burner re: mains lighted as long as gas is supplied to any of 'the top burners and for a time interval followingjthe e rtinguisn rnent of'the l ast top burner M W 4 Other and further -objects and advantages of the invention will be apparent from the following description of-an embodiment thereof which is shown i the ac; cq a n drawbainnth rumose of illu ra n the nu h ples, of i inv tion I r hsi iaw ism Figure 1 is a ,fragmentary perspective view of a gas stove p artly cut ,away, incorporating one-,iorrn of the,

pre n t-i e iqn; nd.

figurelis airagmentary view partly in section, of a P n h ga supp y; t m. fqrzthe, sni gn Pil tbur enof tho-present ignition-,,system., 1,:

ho n qnilt as Pa icul s ll St a s emhp the" en q with the arrangement for automatically lighting the ignin P lo b r n e 0 o ni -a m b rn shut-off valve which forms the subject matter of the copending application oflllalph F. Koebbernan and Leonard H. .McCammant, Serial Number 217,1 6,4, filed March 1 L 0! .Ba sn N 6 ,8,051 gra d. December 28, 1954. ,Howeyer, it is to be understood that .this aspectof the present disclosureis merely for the purposes of A illustrating the l operation, of l the l invention and that the preseritinvention embraces the use of any suitable means for lighting the ignition pilot .burnerautornatically in response to opening a main burnenshut-ofi valve.

vReferring to the drawing, in Fig. 1 the stove is generally indicated at 11 and includes a horizontal top l2 and a baclg rail porti on 13. upstandingfrom thestove top, The conventional top burners 14, 15, include simmer burners 16 and 17 respectively, and main burners 18 and 1 rss eqfi elw Theses su p o the t p u n through two-way miners 29, 2 1 under the control of main shut-off valves 22 23, whose opening and closing is controlledby theangularlvmovablemanual knobs 24, 25, as is well known in theart ,The gas input to each of these valves is from gas main 2 6, whichextends along the front of the stovebeneath the top thereof. The output from the valves"22, 23 extends through gas air mixing valves 27, 28 and thenee to the, top burners. Valve 23 is provided with twoontlet conduits leading to themix: ing valve 28,'one,, conduit 29 from the simmer burner 17, and the; other, conduit 30 for the main burner19= A'" similar arrangement is provided between the,ma in shut-offvalve ,,2 2 and the top lp urner 14, comprising simmer burner 16 and the main burner-18,; whichiit controls.

The ignition means for these burners includes a constan tly burning pilot 31 wl1ih resq ves ,its ,gas supply througha pipe 3 2 diree tly from thegas main 26-inde: pendently o f any' of thegnain shutoif nvalves, Constant pilot burner}! is positioned under the back railofthe stove and is provided withi an upwardly e rtendingntube 33 d s d wait-1 dsommunica s w th'th t mo p e th ou h atom 5 f rmed in th opsoflhe a l. 0 th Sta e.- A, h r z nta fla tube 5-- m u catesjat one end with the constant pilot burner 31, and has its other end disposed in communication with the ignition pilot burner which actsas ,the ignition pilot for top burners 1 4, 15, The ignition pilot burner, isdisposed betweenthetop burners 1fl, 151and communi: t swwith th s mmer se tions the o by means-10f fla h ube nti 38 e vs c i e T ignition pil0t burner,.% is positioned adjacent the open frontend 35a of horizontal flash tube 35. An aperture 368: formedin the side .of theignition pilot burnerf-36 communicates with the open end 35a of the flash tube, whileanother aperture 36b formed in the topof the ignition, pilot burner ddeommunicateswith the flash tubes 37 and 38 which lead, respectively, tothe top burners,14 and 15., These latter flash tnbes 3 38 ,c0nverge ,together adjacent the ignition pilot burner,36 and are connected at that acint b n. annular mem ,d d. above h ig i: tion pilot 36. l I I In operation, when one of the manual knobs 24 or 2.5 'isturned to openthe respective main shut-ofE valve 2 r 1 min: pp y g. j q t .qorr pon i p burner, gas is also supplied to the flash tube S Sand to the ignition pilot 36. The fuel in flash tube 35 is ignited by the flame at constant pilot burner 31 and flashes back to ig nite the ignition pilot-burner; Simultaneousiy the adjacent flash tube 37 or 38 is filled with an air-gas mixture, fromitstopburner, which mixture is ignited by 3 Flash tube 35 is provided at its under side with a plurality of apertures. Into each of these apertures extends .a gas jet supply port 40 in the form of a tube inclined upwardly at an angle to communicate with the respective apertures. Each supply port 40 is mounted at its other end in a mounting stud 41 positioned on flash tube manifold 42. Each port 40 communicates with the interior of manifold 42 to receive its gas supply therefrom. Manifold 42 is connected at one end to a fitting 43 on which the ignition pilot burner 36 is supported. Both the flashtube manifold 42 and the ignition pilot burner 36 communicate interiorly' with fitting 43 and with the serially arranged gas supply conduits 44 and 138, which supply an air-gas mixture to both the flash-tube manifold and the ignition pilot burner. An air-gas mixture chamber 44a positioned ahead of conduit 44 serves to mix air and gas to form a combustible mixture. A fitting 45 in the supply line to conduit 44 receives its gas supply from both the main shut-off valve 22, through line 46, and the main shut-off valve 23, through line 47. Thus, by opening either of the main shut-ofl valves an air-gas mixture is supplied to the flash tube 35 and to the ignition pilot burner 36, as well as to the corresponding top burner. A throttling valve 48, or alternatively, a flow restricting orifice, is interposed in the gas line 138 to the flash-tube manifold 42 and the ignition pilot burner 36 to limit the gas pressure therein.

For providing a gas supply to the ignition pilot burner 36 which is. independent of the main burner shut-off valves, there is provided a safety valve, indicated generally at 119, which communicates with the manifold 26 through the conduit 134 and with the interior of the fitting 45 through the conduit 136. The safety valve 119 defines a chamber 118 which communicates, through the conduit 136 and the fitting 45, with the pilot burner supply conduits 46, 47 from the respective main burner shutoif valves 22, 23. A flexible diaphragm 120 separates the lower valve chamber 118 from an upper valve chamber 121. A ball valve 123 is normally seated to block port 122 leading out of the upper valve chamber 121. An annular nut 124 formed with a port 124a communicating with the atmosphere is positioned in the top wall 125 of the casing of valve 119 above the ball valve 123. Another orifice 126 communicating with the atmosphere is also formed in the top wall 125, and an adjustable tapered needle member 127 partially blocks the communication between orifice 126 and the upper valve chamber 121. The position of needle 127 determines the rate at which air may enter into the upper valve chamber 121.

A plunger 128 is connected rigidly to a plate 129 secured to diaphragm 120. Above this connection the plunger 128 carries a transverse disk 128:: against which the coil spring 130 acts to bias the plunger 128 to its lower position. A valve closure member 131 is carried on plunger 128 and normallybears against seat 132 to close port 133. Port 133 is adapted to effect communication between the lower valve chamber 118 and the conduit 134 connected directly to the gas main 26. An adjustable valve 135 controls the gas pressure in conduit 134. The valve 135 is initially adjusted at the time of installing the stove so that the pressure drop in the gas flowing therethrough from the gas main 26 to the pilot burner 36, as occurs when all of the shut-off valves are closed, and before the diaphragm operated valve 131 is closed, produces a resultant pressure in conduit 134 and the lower valve chamber 118 which is insuflicient to overcome the bias of the spring 130 whereby the latter urges the diaphragm 120 to its normal position to close the valve 131.

In the operation of this system, when any one of the main shut-off valves 22, 23 is open, by manually turning the corresponding knob 24 or 25, gas is supplied through the corresponding conduit 46 or 47 to the fitting 45 and thence to the conduit 138 leading to the ignition pilot burner 36 and the flash tube manifold 42, as well as to the proper top burner. The throttling valve 48 causes gas pressure to be built up in the lower valve chamber 118. Diaphragm 120 is thereby forced upward, against the force of spring 130, to lift the valve closure member 131 away from its seat and furnish an additional supply of gas to the ignition pilot burner 36 directly from manifold 26 and independent of the manually-operated main shutoif valves.

Upward movement of the valve diaphragm 120 also forces air from the upper valve chamber 121 past ball valve 123 to atmosphere. When the upward gas pressure on diaphragm 120 is reduced, air from outside the valve casing is permitted to leak back into the upper valve chamber 121 at a rate determined by the position of the needle 127. This return of air into the upper valve chamber 121 takes place when the gas pressure in the conduits 46, 47 drops in response to closing the last one of the main shut-0E valves 22, 23 to be closed. At this time, diaphragm 120 returns to its normal position to seat the valve closure member 131. The rate at which diaphragm 120 returns to its normal position is determined by the opposing gas pressure in conduit 134, as well as by the force of coil spring 130 and the rate of return of air through aperture 126 into the upper valve chamber 121. Gas is continued to be supplied through conduit 134 to the ignition pilot burner 136 to maintain a stand-by pilot flame thereat until diaphragm 120 has returned to its normal position to close valve 131.

The foregoing described arrangement provides a time delay in shutting off the ignition pilot burner after the last top burner is shut oif, thereby insuring prompt relighting of a topburner which might be again turned on within a brief interval.

While in the foregoing description there is disclosed a specific form of the present invention, it is to be understood that various changes and modifications departing from the described form of the invention may be adopted which do not depart from the spirit and scope of this invention.

I claim:

1. A gas burner control system comprising a gas supply line, a main gas burner, a conduit for supplying gas from said supply line to said main burner, a shut-ofli valve in saidconduit forcontrolling the flow of gas to the main burner, a pilot burner in igniting relation to said main burner, a pilot burner conduit by-passing said shut-off valve for supplying gas from said supply line to said pilot burner, valve means controlling the flow of gas through said pilot burner conduit, pressure responsive means for controlling operation of said valve means, conduit means connecting said pressure responsive means to said shut-oflvalve for supplying gas from said supply line to said pressure responsive means under the control of said shut-011' valve, said pressure responsive means being operative to open said valve means and maintain said valve means open while gas under pressure is applied thereto through said conduit means, and time delay means for maintaining said valve means open for a predetermined time following the release of pressure in said conduit means due to the closing of said shut-0E valve.

2. A gas burner control system comprising a supply line, a main gas burner, a conduit supplying gas from said supply line to said main burner, a shut-oil valve in said conduit controlling the flow of gas to the main burner, a pilot burner in igniting relation to the main burner, means operative in response to the opening of the main shut-off valve for igniting the pilot burner, a pilot burner conduit by-passing said shut-off valve for supplying gas from the supply line to the pilot burner, valve means controlling the flow of gas through said conduitfmeans, pressure responsive means for operating said valve means, conduit means connecting said pressure responsive means to said shut-offvalve for supplying gas from said supply line to said pressure responsive means was under the control of said shut-E valve, said pressure responsive means being operative tOQOPeH-Said valve means and o maintain. said .valvermeans" .openiwhilelgisffrbm said supplyjine.israppliedtthereto through said conduit means, and time delayvmeans.forimaintaining stiidtvalve means open forra predeterminediim.intervallfollbwing therreleaseof pressure intsaidlconduit means due to.;the closing of said shut-off valve:

3, A top burner control sy st'err'i'fbr a gas stove comprising a gas supply line a plurality of top burners, a plurality of conduits supplying gas from said supply line to said top burners, a manually operated shut-off valve in each of said conduits controlling the flow of gas to the respective top burner, a pilot burner in igniting relation to said top burners, a pilot burner conduit connected to said supply line and to said pilot burner for supplying gas to said pilot burner, valve means in said pilot burner conduit controlling the flow of gas therethrough to the pilot burner, pressure responsive means for operating said valve means, mean connecting said pressure responsive means to each of said shut-off valves to supply gas from the supply line to said pressure responsive means in response to opening of any of said shut-off valves, said pressure responsive means being operative in response to the gas pressure supplied thereto under the control of the shut-off valves to open said valve means and maintain said valve means open while any one of said shut-off valves is open, means for igniting said pilot burner, and time delay means for maintaining said valve means open for a time interval following the release of gas pressure on said pressure responsive means due to the closing of the last one of said shut-off valves. 7

4. A top burner control system for a gas stove including a gas supply line, a plurality of top burners, a plurality of conduits supplying gas to said top burners from said supply line, a manually operated shut-ofi valve in each of said conduits controlling the flow of gas to the respective top burner, a pilot burner in igniting relation to said top burners, a plurality of pilot burner conduits for supplying gas to said pilot burner under the control of a corresponding shut-off valve, each of said shut-off valves being operative when open to supply gas to the pilot burner and to the corresponding top burner, valve means communicating with each of said pilot burner conduits and op-- erative in response to the pressure of gas in said pilot burner conduits when a shut-off valve is opened to by-pass said shut-off valve and establish a gas supply from said supply line to the pilot burner independent of said shut-ofi valves, and time delay means for maintaining said valve means open for a time interval following the release of said gas pressure due to the closing of the last one of said shutoff valves to be closed.

5. A top burner control system for a gas stove including a gas supply line, a plurality of top burners, a plurality of conduits supplying gas to said top burners from said supply line, a manually-operated shutotf valve in each of said conduits controlling the flow of gas to the respective top burner, a pilot burner in igniting relation to each of said top burners, a plurality of pilot burner conduits for supplying gas to said pilot burner each under the control of a corresponding shut-off valve, flow restriction means communicating with said pilot burner conduits to limit the pressure of gas supplied to the pilot burner and to establish back pressure in said pilot burner conduits, pilot burner conduit means for supplying gas from the supply line to the pilot burner, valve means controlling the flow of gas through said conduit means, pressure responsive means for operating said valve means, means connecting said pressure responsive means with said pilot burner conduits between said flow restriction means and said shut-off valves for operating the pressure responsive means in response to the back pressure in said pilot burner conduits when a shut-ofi valve is opened to open said valve means and establish a gas supply through said conduit means to the pilot burner, and time delay means for maintaining said valve means open for a time interval following ,the, releaseof the back pressure inlsaid pilot burner conduit srdue to the closi ng oi th e last one of said shut otf valv es to'be closed.

control system fora main gas burner comprising; a ga s'ls upply line, a shut-01fvalve controlling the fiow of gasto the main burner from the suppl 'n'ega pilot burner for igniting the mainburner, a pilot urner v nd ii f supplying gasto a d pi stb fi tndss th sentmrorsaid shut-ofi valve, fitiwrestriction meansin said pilot burner conduit to limit the pressure on the gas supplied to the pilot burner and to establish back pressure in said pilot burner conduit, pilot burner conduit means by-passing said shut-0E valve for supplying gas from the supply line to the pilot burner, valve means controlling the flow of gas through said conduit means, pressure responsive means for operating said valve means, means connecting said pressure responsive means with said pilot burner conduit between said flow restriction means and shut-01f valve for operating said pressure responsive means in response to the back pressure in said pilot burner conduit to open said valve means and establish a gas supply through the conduit means to the pilot burner, and time delay means for maintaining said valve means open for a time interval following the release of the back pressure in said pilot burner conduit due to the closing of said shut-off valve.

7. A gas burner control system comprising a gas supply line, a conduit supplying gas from said supply line to said main burner, a shut-01f valve in said conduit controlling the flow of gas to said main burner, a pilot burner in igniting relation to said main burner, a first pilot burner conduit means connected to said shut-off valve for supplying gas from the supply line to said pilot burner under the control of said shut-off valve, a second pilot burner conduit means by-passing said shut-off valve for supplying gas from the supply line to said pilot burner independently of said shut-off valve, valve means controlling the flow of gas through said second conduit means, means responsive to the gas pressure in said first conduit means for opening said valve means and for maintaining said valve means open while said shut-oif valve is open, and means for closing said valve means after a time delay following the closing of said shut-off valve to interrupt the independent gas supply to the pilot burner.

8. A gas burner control system comprising a gas supply line, a main gas burner, means including a shut-off valve for controlling the supply of gas to the main burner from said supply line, a pilot burner in igniting relation to said main burner, a valve body having first and second chambers, a diaphragm separating said chambers, said valve body being formed with an ignition pilot burner port communicating with said first chamber, a valve closure member connected to said diaphragm for movement therewith from a closed position blocking flow through said port to an open position, a conduit communicating said port with said supply line, conduit means communicating said first chamber with said pilot burner and with said shut-01f valve to supply gas to said first chamber and to said pilot burner when said shut-oif valve is opened, a first flow restriction in said conduit means between said pilot burner and said first chamber for limiting the flow of gas to said pilot burner and to build up back pressure in said first chamber Whenthe shut-01f valve is opened thereby to displace said diaphragm and move said closure member to an open position, means yieldably urging said closure member to its closed position, a second flow restriction in said conduit for limiting the pressure on the gas flowing through said conduit into said first chamber to an amount insuflicient to maintain the diaphragm in its displaced position, and time delay means communicating with said second chamber for maintaining said closure member in its open position for a time interval following the release of pressure in said first chamber.

(References on following page) References Cited in. the file of t1 1 is patent UNITED STATES PATENTS Reid Mar. 24, 1908 Dester Oct. 9, 1928 Sorensen Dec. 1, 1931 Jacobi May 17, 1932 Mantz May 17, 1932 Stockmeyer Apr. 30, 1935 8 Jones et a1. Aug. 4, 1936 Laghetto Apr. 27, 1937 Camp Aug. 27, 1940 Ray Apr. 18, 1944 Strobel Jan. 13, 1953 Ray Sept. 15, 1953 FOREIGN PATENTS Great Britain Oct. 19, 1939 

